28316

Appears in sequences

• a(0) = 1, a(n) = 26*n^2 + 2 for n>0.at n=33A010016
• Numbers n such that 123*2^n-1 is prime.at n=31A050587
• a(n) is the total number of pentagrams in a variant of pentagram fractal after n iterations.at n=13A256571
• O.g.f. A(x) satisfies: [x^n] exp( n*x*A(x) ) * (n+1 - n*A(x)) = 0 for n >= 1.at n=11A317338
• Expansion of Product_{k>0} theta_4(q^k)/theta_3(q^k), where theta_3() and theta_4() are the Jacobi theta functions.at n=30A320970
• Numbers k such that tau(k) + tau(k+1) + tau(k+2) + tau(k+3) = 16, where tau is the number of divisors function A000005.at n=23A350686